20+ practice questions focused on Replication — one of the most tested topics on the MongoDB Certified DBA Associate exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Replication PracticeWhich TWO of the following conditions must be met for a replica set member to be eligible to become a primary?
Explanation: Election eligibility is strictly governed by the member's current state and its visibility to the majority of the replica set. A member must be caught up with the oplog to ensure minimal rollback risk and must maintain connectivity to a majority of the set to prevent split-brain scenarios. Understanding these criteria is essential for troubleshooting why a specific node fails to transition to primary during failover events.
Which setting should be used in a connection string to ensure that an application only reads from a node that has data at least as fresh as the primary?
Explanation: Causal consistency ensures that read operations reflect the effects of all preceding write operations within the same session. By enabling causal consistency and using appropriate read concerns, applications guarantee that their view of the data is consistent and never reverts to an older state, preventing the common issue of reading stale data after an immediate write operation.
Which THREE of the following are valid methods to add a new member to an existing replica set?
Explanation: Adding nodes is a standard administrative task that must be done carefully to avoid disrupting existing replication. Whether using the shell, updating the configuration object, or automating via infrastructure code, the core logic is the same: the configuration object must be updated and pushed to the current primary to propagate the change to the rest of the nodes.
Refer to the exhibit. If node 0 (the current primary) goes offline, which node will be elected as the new primary?
Explanation: Replica set elections are influenced by the priority value. Nodes with higher priority are preferred candidates. When the current primary fails, the node with the highest priority among the available nodes will win the election. If multiple nodes have the same highest priority, the one with the most recent oplog data wins, ensuring that the most capable and up-to-date node takes over.
What is the primary purpose of the 'vote' field in the replica set configuration?
Explanation: The 'votes' field allows administrators to control how many votes a member contributes to an election. By default, all members have 1 vote. Setting this to 0 can be useful in specific configurations, such as preventing a geographically distant node from impacting election outcomes while still allowing it to maintain a copy of the data for local read scaling.
+15 more Replication questions available
Practice all Replication questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Replication. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Replication questions on the C100DBA frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Replication is tested as part of the MongoDB Certified DBA Associate blueprint. Practicing with targeted Replication questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free C100DBA practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but Replication is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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